Does anyone make any kind of reusable adapter that you could put a 20ga shell into which would make it larger to function like a 12ga shell? This way you could load 20ga rounds into your 12ga for practice and also load with 12ga for when it counts.

kraMrD
Briley makes SS full tube inserts that are very good. I have a 12ga O/U and have inserts for this gun in 20ga, 28ga and .410ga.
The barrels had to be sent to Briley to be properly fitted. Don't know if this can be done for sem-auto and pump guns. However you can check this out at their website. http://www.briley.com/

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